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This is a Shunting Permitted Indicator (SPI) and works in conjunction with a stop signal or a shunt signal. The SPI shows a yellow cross illuminated by light and authorises the Driver to shunt past the associated stop/shunt signal in the ‘On’ position. A proceed hand signal must always be shown at the signal.
Posted by Rajeev Shrivastava on 2008 Feb 19 15:46:07 +0000